New PC Throwing Frequent Memory Access Errors... Less Frequently When Overclocked

I'm running into a very strange issue with my PC that I could use some help diagnosing. Full spec list:

• Asus Strix x470I Motherboard
• Ryzen 5 2600x
• Corsair DDR4-3000 1x16gb
• Samsung 970 Evo
• Zotac GTX 1070 (Mini)

Full story: When I first built the PC a few weeks ago, I was getting errors left and right that resembled this:

OneDrive.exe - Application Error The instruction at 0x00000077ADCC5B referenced memory at 0x000000000014. The memory could not be read. Click on OK to terminate the program.

The name of the program could be anything, oftentimes the program I have running, like BlizzardLauncher.exe or something like that. The memory addresses were always random. The program would always exit. This would happen every minute, or more often, making the computer unusable.

There are some programs it will never happen to, like internet browsers. There are other programs that I can literally never launch, even with the "stabilization" I describe below and in the title, like the Blizzard Launcher. There are other programs that will work for a while then crash after an inconsistent amount of time.

I eventually found a way to stabilize the system; overclocking it. Specifically, I initially discovered this with a max stock Asus "factory" overclock, which it advertises as 12% up on the CPU and 3% up on the Memory. However, this wasn't perfect; it would still throw memory errors on specific applications, and maybe once or twice an hour. I eventually started playing with the overclock settings more manually, and drove the CPU clock multiplier from the default of 37 (I think) up to 44. Thermally, this wrecks havoc on the system, and is only supportable via a patent-pending external box fan cooler blowing directly into the system. But stability-wise, it helps a lot. But it still isn't perfect, and errors will still be thrown here and there.

If I take the clock back down to stock, it reverts right back to the old behavior; I can't even use the machine because windows are popping up so often warning about memory reference errors.

I've tried re-installing Windows. Eight times, actually, using different flash drives, different ISO downloads, confirming the MD5 of every download, burning the drive on both the "broken" PC and a 100% working Mac. I've tried installing Ubuntu, and that actually appears much more stable, giving no immediate errors or indication that anything is wrong. But, this is a gaming PC, so I can't stick with it.

I've actually got a 2x16gb memory kit. I've tried both sticks of memory individually and together. They both do the exact same thing. I'm currently only running one of the sticks.

I've also got two identical Asus Strix x470I motherboards. Don't ask. Behavior is identical on both boards.

I'd appreciate any help investigating this problem. If I need to return/sell/RMA something, that's fine, but I simply don't know what component it could be. Thank You!